Rounding and Animal Feed Calculations
After formulating a feed it is possible to round the ingredients, using an additional feature in WinFeed. This facility is accessed by clicking on this icon on the button bar, thereby opening a dialog window marked Manipulate ingredients (see screenshot below). Rounding may be carried out for one or more of the ingredients in a feed mixture in one of three different ways: manually, by applying built-in rounding coefficients ( Round all), or by the use of bag weights set by the user ( Round to nearest bag weight). Rounding is applied to both the dry matter and the as-is concentrations.
Where the Round all option is applied, the rules used are that ingredients at concentrations below 10g/kg are not rounded; those between 10 and 100g/kg are rounded to the nearest 1g/kg; and those above 100g/kg are rounded to the nearest 10g/kg.
If any of the nutrient bounds is broken due to rounding, these nutrients are coloured purple in the nutrient window (as shown below). It is up to the user to decide whether or not to accept that these bounds have been broken.
Animal Feed Calculations
An animal feed calculator has been included to assist nutritionists who are formulating feeds where feed weight is not controlled, and where feeds are designed to provide a given dry matter intake per day. Horse feeding and liquid feeding of pigs are examples. The animal feed calculation is combined with rounding so that the data for rounded feeds may also be used.
At the top of the Manipulate ingredients window is a button bar marked Show animal feed calculations (as shown in the screenshot above). By pressing this bar an additional dialog window opens that allows the user to calculate the amount and cost of the given feed required to satisfy the requirements of different numbers of animals at a specified daily dry matter intake. Once a daily DM intake/animal is entered, the daily as-is and DM intakes of all ingredients and nutrients are displayed, as illustrated below.